期刊
GRUNDWASSER
卷 25, 期 3, 页码 215-230出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00767-020-00455-x
关键词
Rock glacier; Base flow; Recession analysis; Groundwater storage capacity; Permafrost
资金
- Austrian FederalMinistry of Sustainability and Tourism
- Federal State of Styria [101093]
- Federal State of Salzburg [101093]
- Federal State of Carinthia [101093]
- Federal State of Vorarlberg [101093]
- Federal State of Tyrol [101093]
Rock glaciers are the most prominent landforms of alpine permafrost and comprise complex shallow aquifer systems in (high) alpine catchments. Recession analyses of groundwater discharge of four active rock glaciers that contain permafrost ground ice show that they have a base flow component of the order of a few liters per second, similar to that of a relict rock glacier in which permafrost ground ice is absent. This is related to an unfrozen (fine-grained) base layer with a thickness of about 10 m. Based on a threshold analysis of precipitation events and event water discharge, depressions atop the bedrock or the permafrost table seem to play only a minor role in storing groundwater. This important finding has rarely been documented, but is highly relevant for optimal groundwater resources management in sensitive (high) alpine catchments and ecosystems. All the rock glaciers analyzed here are located in the Austrian Alps and represent the nationwide sites where suitable discharge data are available. The analysis highlights the hydrogeological importance of these discrete permafrost-derived debris accumulations as complex shallow groundwater bodies with important-but limited-storage and buffer capabilities.
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